M30LW128D datasheet(12/57 Pages) STMICROELECTRONICS

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M30LW128D

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MEMORY ENABLE

Each internal M58LW064D memory has 3 Chip

Enable signals to allow up to 4 memories to be

connected together without the use of additional

glue logic, see Table 2, Single M58LW064D De-

vice Enable. In this way the address space is con-

tiguous and the microcontroller only requires one

Chip Enable, E, to control both memories.

Figure 6 shows how a 128Mbit Stacked Flash

memory is created using two M58LW064D memo-

ries. One of the memories is located in the Upper

Address space and is referred to as the Upper

Memory, the other is located in the lower address

space and is referred to as the Lower Memory, see

Figure 7, Block Addresses.

The E0, E1 and E2 Chip Enables of each

M58LW064D memory are connected internally, as

shown in Figure 6.

The external signal A23 is used to select between

the Upper and Lower memories. A23 is connected

to E2 of the Upper Memory and to E1 of the Lower

Memory.

E1 of the Upper Memory is always connected to

VDD while E2 of the Lower Memory is always con-

nected to VSS.

The external Chip Enable, E, is used to enable or

disable the memory selected by A23, see Table 3,

M30LW128D Device Enable. E is connected to the

E0 signal of both memories.

The M30LW128D (TSOP56 and TBGA64 packag-

es only) supports both x8 and x16 bus widths. It is

also possible to have a x32 bus width by connect-

ing two x16 bus width M30LW128D devices to-

gether. Note that the two M30LW128D devices

must use the same E0 as Chip Enable, as E1 and

E2 are not connected internally.

Table 2. Single M58LW064D Device Enable, E2, E1 and E0

Table 3. M30LW128D Device Enable, A23 and E

Note: 1. UM = Upper Memory, LM = Lower Memory.

Device

VIL

Enabled

VIL

VIH

Disabled

VIL

VIH

VIL

Disabled

VIL

VIH

Disabled

VIH

VIL

Enabled

VIH

VIL

VIH

Enabled

VIH

VIL

Enabled

VIH

Disabled

A23

Internal Signals

Chip Enable, E

Upper Memory

Lower Memory

E2UM = E1LM

(1)

E1UM

(1)

E2LM

(1)

E0UM = E0LM

(1)

VIL

VDD (VIH)VSS (VIL)

VIL

Disabled

Enabled

VIL

VIH

Disabled

VIH

VIL

Enabled

Disabled

VIH

Disabled

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